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| <a name="Blackfin-Options-1"></a> |
| <h4 class="subsection">3.17.6 Blackfin Options</h4> |
| <a name="index-Blackfin-Options"></a> |
| |
| <dl compact="compact"> |
| <dt><code>-mcpu=<var>cpu</var><span class="roman">[</span>-<var>sirevision</var><span class="roman">]</span></code></dt> |
| <dd><a name="index-mcpu_003d"></a> |
| <p>Specifies the name of the target Blackfin processor. Currently, <var>cpu</var> |
| can be one of ‘<samp>bf512</samp>’, ‘<samp>bf514</samp>’, ‘<samp>bf516</samp>’, ‘<samp>bf518</samp>’, |
| ‘<samp>bf522</samp>’, ‘<samp>bf523</samp>’, ‘<samp>bf524</samp>’, ‘<samp>bf525</samp>’, ‘<samp>bf526</samp>’, |
| ‘<samp>bf527</samp>’, ‘<samp>bf531</samp>’, ‘<samp>bf532</samp>’, ‘<samp>bf533</samp>’, |
| ‘<samp>bf534</samp>’, ‘<samp>bf536</samp>’, ‘<samp>bf537</samp>’, ‘<samp>bf538</samp>’, ‘<samp>bf539</samp>’, |
| ‘<samp>bf542</samp>’, ‘<samp>bf544</samp>’, ‘<samp>bf547</samp>’, ‘<samp>bf548</samp>’, ‘<samp>bf549</samp>’, |
| ‘<samp>bf542m</samp>’, ‘<samp>bf544m</samp>’, ‘<samp>bf547m</samp>’, ‘<samp>bf548m</samp>’, ‘<samp>bf549m</samp>’, |
| ‘<samp>bf561</samp>’, ‘<samp>bf592</samp>’. |
| </p> |
| <p>The optional <var>sirevision</var> specifies the silicon revision of the target |
| Blackfin processor. Any workarounds available for the targeted silicon revision |
| are enabled. If <var>sirevision</var> is ‘<samp>none</samp>’, no workarounds are enabled. |
| If <var>sirevision</var> is ‘<samp>any</samp>’, all workarounds for the targeted processor |
| are enabled. The <code>__SILICON_REVISION__</code> macro is defined to two |
| hexadecimal digits representing the major and minor numbers in the silicon |
| revision. If <var>sirevision</var> is ‘<samp>none</samp>’, the <code>__SILICON_REVISION__</code> |
| is not defined. If <var>sirevision</var> is ‘<samp>any</samp>’, the |
| <code>__SILICON_REVISION__</code> is defined to be <code>0xffff</code>. |
| If this optional <var>sirevision</var> is not used, GCC assumes the latest known |
| silicon revision of the targeted Blackfin processor. |
| </p> |
| <p>GCC defines a preprocessor macro for the specified <var>cpu</var>. |
| For the ‘<samp>bfin-elf</samp>’ toolchain, this option causes the hardware BSP |
| provided by libgloss to be linked in if <samp>-msim</samp> is not given. |
| </p> |
| <p>Without this option, ‘<samp>bf532</samp>’ is used as the processor by default. |
| </p> |
| <p>Note that support for ‘<samp>bf561</samp>’ is incomplete. For ‘<samp>bf561</samp>’, |
| only the preprocessor macro is defined. |
| </p> |
| </dd> |
| <dt><code>-msim</code></dt> |
| <dd><a name="index-msim"></a> |
| <p>Specifies that the program will be run on the simulator. This causes |
| the simulator BSP provided by libgloss to be linked in. This option |
| has effect only for ‘<samp>bfin-elf</samp>’ toolchain. |
| Certain other options, such as <samp>-mid-shared-library</samp> and |
| <samp>-mfdpic</samp>, imply <samp>-msim</samp>. |
| </p> |
| </dd> |
| <dt><code>-momit-leaf-frame-pointer</code></dt> |
| <dd><a name="index-momit_002dleaf_002dframe_002dpointer-1"></a> |
| <p>Don’t keep the frame pointer in a register for leaf functions. This |
| avoids the instructions to save, set up and restore frame pointers and |
| makes an extra register available in leaf functions. The option |
| <samp>-fomit-frame-pointer</samp> removes the frame pointer for all functions, |
| which might make debugging harder. |
| </p> |
| </dd> |
| <dt><code>-mspecld-anomaly</code></dt> |
| <dd><a name="index-mspecld_002danomaly"></a> |
| <p>When enabled, the compiler ensures that the generated code does not |
| contain speculative loads after jump instructions. If this option is used, |
| <code>__WORKAROUND_SPECULATIVE_LOADS</code> is defined. |
| </p> |
| </dd> |
| <dt><code>-mno-specld-anomaly</code></dt> |
| <dd><a name="index-mno_002dspecld_002danomaly"></a> |
| <p>Don’t generate extra code to prevent speculative loads from occurring. |
| </p> |
| </dd> |
| <dt><code>-mcsync-anomaly</code></dt> |
| <dd><a name="index-mcsync_002danomaly"></a> |
| <p>When enabled, the compiler ensures that the generated code does not |
| contain CSYNC or SSYNC instructions too soon after conditional branches. |
| If this option is used, <code>__WORKAROUND_SPECULATIVE_SYNCS</code> is defined. |
| </p> |
| </dd> |
| <dt><code>-mno-csync-anomaly</code></dt> |
| <dd><a name="index-mno_002dcsync_002danomaly"></a> |
| <p>Don’t generate extra code to prevent CSYNC or SSYNC instructions from |
| occurring too soon after a conditional branch. |
| </p> |
| </dd> |
| <dt><code>-mlow-64k</code></dt> |
| <dd><a name="index-mlow_002d64k"></a> |
| <p>When enabled, the compiler is free to take advantage of the knowledge that |
| the entire program fits into the low 64k of memory. |
| </p> |
| </dd> |
| <dt><code>-mno-low-64k</code></dt> |
| <dd><a name="index-mno_002dlow_002d64k"></a> |
| <p>Assume that the program is arbitrarily large. This is the default. |
| </p> |
| </dd> |
| <dt><code>-mstack-check-l1</code></dt> |
| <dd><a name="index-mstack_002dcheck_002dl1"></a> |
| <p>Do stack checking using information placed into L1 scratchpad memory by the |
| uClinux kernel. |
| </p> |
| </dd> |
| <dt><code>-mid-shared-library</code></dt> |
| <dd><a name="index-mid_002dshared_002dlibrary"></a> |
| <p>Generate code that supports shared libraries via the library ID method. |
| This allows for execute in place and shared libraries in an environment |
| without virtual memory management. This option implies <samp>-fPIC</samp>. |
| With a ‘<samp>bfin-elf</samp>’ target, this option implies <samp>-msim</samp>. |
| </p> |
| </dd> |
| <dt><code>-mno-id-shared-library</code></dt> |
| <dd><a name="index-mno_002did_002dshared_002dlibrary"></a> |
| <p>Generate code that doesn’t assume ID-based shared libraries are being used. |
| This is the default. |
| </p> |
| </dd> |
| <dt><code>-mleaf-id-shared-library</code></dt> |
| <dd><a name="index-mleaf_002did_002dshared_002dlibrary"></a> |
| <p>Generate code that supports shared libraries via the library ID method, |
| but assumes that this library or executable won’t link against any other |
| ID shared libraries. That allows the compiler to use faster code for jumps |
| and calls. |
| </p> |
| </dd> |
| <dt><code>-mno-leaf-id-shared-library</code></dt> |
| <dd><a name="index-mno_002dleaf_002did_002dshared_002dlibrary"></a> |
| <p>Do not assume that the code being compiled won’t link against any ID shared |
| libraries. Slower code is generated for jump and call insns. |
| </p> |
| </dd> |
| <dt><code>-mshared-library-id=n</code></dt> |
| <dd><a name="index-mshared_002dlibrary_002did"></a> |
| <p>Specifies the identification number of the ID-based shared library being |
| compiled. Specifying a value of 0 generates more compact code; specifying |
| other values forces the allocation of that number to the current |
| library but is no more space- or time-efficient than omitting this option. |
| </p> |
| </dd> |
| <dt><code>-msep-data</code></dt> |
| <dd><a name="index-msep_002ddata"></a> |
| <p>Generate code that allows the data segment to be located in a different |
| area of memory from the text segment. This allows for execute in place in |
| an environment without virtual memory management by eliminating relocations |
| against the text section. |
| </p> |
| </dd> |
| <dt><code>-mno-sep-data</code></dt> |
| <dd><a name="index-mno_002dsep_002ddata"></a> |
| <p>Generate code that assumes that the data segment follows the text segment. |
| This is the default. |
| </p> |
| </dd> |
| <dt><code>-mlong-calls</code></dt> |
| <dt><code>-mno-long-calls</code></dt> |
| <dd><a name="index-mlong_002dcalls-3"></a> |
| <a name="index-mno_002dlong_002dcalls-1"></a> |
| <p>Tells the compiler to perform function calls by first loading the |
| address of the function into a register and then performing a subroutine |
| call on this register. This switch is needed if the target function |
| lies outside of the 24-bit addressing range of the offset-based |
| version of subroutine call instruction. |
| </p> |
| <p>This feature is not enabled by default. Specifying |
| <samp>-mno-long-calls</samp> restores the default behavior. Note these |
| switches have no effect on how the compiler generates code to handle |
| function calls via function pointers. |
| </p> |
| </dd> |
| <dt><code>-mfast-fp</code></dt> |
| <dd><a name="index-mfast_002dfp"></a> |
| <p>Link with the fast floating-point library. This library relaxes some of |
| the IEEE floating-point standard’s rules for checking inputs against |
| Not-a-Number (NAN), in the interest of performance. |
| </p> |
| </dd> |
| <dt><code>-minline-plt</code></dt> |
| <dd><a name="index-minline_002dplt"></a> |
| <p>Enable inlining of PLT entries in function calls to functions that are |
| not known to bind locally. It has no effect without <samp>-mfdpic</samp>. |
| </p> |
| </dd> |
| <dt><code>-mmulticore</code></dt> |
| <dd><a name="index-mmulticore"></a> |
| <p>Build a standalone application for multicore Blackfin processors. |
| This option causes proper start files and link scripts supporting |
| multicore to be used, and defines the macro <code>__BFIN_MULTICORE</code>. |
| It can only be used with <samp>-mcpu=bf561<span class="roman">[</span>-<var>sirevision</var><span class="roman">]</span></samp>. |
| </p> |
| <p>This option can be used with <samp>-mcorea</samp> or <samp>-mcoreb</samp>, which |
| selects the one-application-per-core programming model. Without |
| <samp>-mcorea</samp> or <samp>-mcoreb</samp>, the single-application/dual-core |
| programming model is used. In this model, the main function of Core B |
| should be named as <code>coreb_main</code>. |
| </p> |
| <p>If this option is not used, the single-core application programming |
| model is used. |
| </p> |
| </dd> |
| <dt><code>-mcorea</code></dt> |
| <dd><a name="index-mcorea"></a> |
| <p>Build a standalone application for Core A of BF561 when using |
| the one-application-per-core programming model. Proper start files |
| and link scripts are used to support Core A, and the macro |
| <code>__BFIN_COREA</code> is defined. |
| This option can only be used in conjunction with <samp>-mmulticore</samp>. |
| </p> |
| </dd> |
| <dt><code>-mcoreb</code></dt> |
| <dd><a name="index-mcoreb"></a> |
| <p>Build a standalone application for Core B of BF561 when using |
| the one-application-per-core programming model. Proper start files |
| and link scripts are used to support Core B, and the macro |
| <code>__BFIN_COREB</code> is defined. When this option is used, <code>coreb_main</code> |
| should be used instead of <code>main</code>. |
| This option can only be used in conjunction with <samp>-mmulticore</samp>. |
| </p> |
| </dd> |
| <dt><code>-msdram</code></dt> |
| <dd><a name="index-msdram"></a> |
| <p>Build a standalone application for SDRAM. Proper start files and |
| link scripts are used to put the application into SDRAM, and the macro |
| <code>__BFIN_SDRAM</code> is defined. |
| The loader should initialize SDRAM before loading the application. |
| </p> |
| </dd> |
| <dt><code>-micplb</code></dt> |
| <dd><a name="index-micplb"></a> |
| <p>Assume that ICPLBs are enabled at run time. This has an effect on certain |
| anomaly workarounds. For Linux targets, the default is to assume ICPLBs |
| are enabled; for standalone applications the default is off. |
| </p></dd> |
| </dl> |
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